
Mintrop field seismograph, recording apparatus and box, for geophysical prospecting
1921
1921
1930-1935
1930-1935
1960
1971-1980
1930-1935
1930-1935
1885
1933-1936
1912
1902
1907
1914
1914
1930-1935
1898
1930-1935
1880
1930-1935
1930-1935
1930-1935
1930-1935
1930-1935
1908
1930-1935
1928
1909
circa 1925
1886
1937-1938
1930-1935
1930-1935
1930-1935
1930-1935
1930-1935